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26-11-2018
Mathematics

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In a certain chemical, the ratio of zinc to copper is 4 to 19. A jar of the chemical contains 684 grams of copper. How many grams of zinc does it contain?

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jdoe0001 jdoe0001

26-11-2018

[tex]\bf \cfrac{zinc}{copper}\qquad 4:9\qquad \cfrac{4}{9}~\hspace{5em}\cfrac{z}{684}=\cfrac{4}{9}\implies z=\cfrac{684\cdot 4}{9}\implies z=304[/tex]

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